System and method of air pollution control for liquid vacuum trucks

Abstract

A system. The system includes a container comprising a cylindrical shell, wherein the cylindrical shell defines an internal volume of the container, and a barrier. The barrier includes a disk slideably disposed within the interior volume of the container, the disk subdividing the interior volume of the container into a first portion and a second portion, and a seal disposed about a circumference of the disk and in sealing contact with an interior surface of the cylindrical shell. The first portion is configured to sustain an internal pressure in a predetermined range; and the second portion is configured to receive a waste material. When the internal pressure is at a maximum value of the predetermined range, the disk has a deflection less than a predetermined deflection at which the sealing contact is compromised.

What is claimed is: 
     
       1. A system comprising:
 a container comprising:
 a cylindrical shell; 
 wherein the cylindrical shell defines an internal volume of the container; 
 
 a barrier comprising:
 a disk slideably disposed within the interior volume of the container, the disk dividing the interior volume of the container into a first portion and a second portion; 
 a seal disposed about the disk and in sealing contact with an interior surface of the cylindrical shell; and wherein: 
 the first portion is configured to sustain an internal pressure in a predetermined range; and 
 the second portion is configured to receive a waste material; and 
 wherein, when the internal pressure is at a maximum value of the predetermined range, the disk has a deflection less than a predetermined deflection at which the sealing contact is compromised. 
 
 
     
     
       2. The system of  claim 1  wherein the internal pressure predetermined range is in the range from about -15 pounds per square inch gauge (psig) to about 35 psig. 
     
     
       3. The system of  claim 1  wherein the disk comprises a metal selected from the group consisting of: stainless steel; brass; nickel-chromium-molybdenum-iron alloy; and nickel-chromium-iron alloy. 
     
     
       4. The system of  claim 1  wherein the disk has a thickness such that the deflection of the disk at the maximum value of the predetermined range is less than the predetermined deflection. 
     
     
       5. The system of  claim 4  wherein the thickness is in the range from about 0.250 inches to 0.375 inches. 
     
     
       6. The system of  claim 1  wherein the barrier further comprises:
 a seal fixture fixedly disposed about the disk, wherein the seal is disposed about a circumference of the seal fixture; and 
 an edge disposed about the periphery of the seal fixture, the edge configured to scrape residue from the interior surface of the shell. 
 
     
     
       7. The system of  claim 6  wherein the disk comprises one or more stiffeners attached to a first side of the disk. 
     
     
       8. The system of  claim 7  wherein the disk further comprises one or more stiffeners attached to a second side of the disk opposite the first side. 
     
     
       9. The system of  claim 8  wherein the plurality of stiffeners attached to the second side is rotationally offset about a central axis of the disk from the plurality of stiffeners attached to the first side. 
     
     
       10. A system comprising:
 a container comprising:
 a cylindrical shell, wherein the cylindrical shell defines an internal volume of the container; 
 a barrier comprising:
 a disk slideably disposed within the interior volume of the container, the disk subdividing the interior volume of the container into a first portion and a second portion; 
 a plurality of stiffeners attached to the disk; and 
 a seal disposed about the disk and in sealing contact with an interior surface of the cylindrical shell; 
 
 a hydraulic cylinder coupled to the disk, the hydraulic cylinder configured to motivate the barrier within the interior volume; and 
 wherein the second portion is configured to receive a waste material. 
 
 
     
     
       11. The system of  claim 10  further comprising a gas monitor coupled to the first portion of the interior volume.